Rhin-O-Tuff High-quality ONYX punch and binding machines, made in the USA and backed by an unprecedented 3-year warranty, provide a solution for all of your onsite business and personal binding needs


Semi-Automatic Wire Closer


Eliminate the manual insertion of wire into documents by switching to the Rhin-O-Tuff 14″ Semi-Automatic Wire Inserter and Closer.

The perfect 3-1 Pitch double-loop binding wire closer can be adjusted to varies sizes from 1/4 inch to 9/16 inch. 14 inch binding edge can be operated with 1 easy step.

The HD8370 Wire Binding machine is superior lightweight and portable but contains the premium all metal construction. The HD8370 works marvelous alone, but it is capable to be attached onto any vertical Rhin-O-Tuff OD or HD punch for the ultimate start and finish combination.

The HD8370 can be used as a stand-alone module or mounted onto any vertical punching Rhin-O-Tuff OD or HD machine.

ONYX HD8370 Images

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Product Details
Dimensions: (H / W / D) 16″ x 19″ x 14″ 
Weight37 lbs
Max Capacity14″
Max Binding Edge14″
Warranty3 years
Part NumberHD8370 ONYX
Shipping Weight

42.5 lbs


  • Closes 3:1 pitch Wire-O® up to a 14″ binding edge 
  • Binds books from 5 1/2″ to 14″ in width 
  • Closing capacity: 1/4″ to 9/16″ with standard 3:1 pitch wire. 
  • Inserts and closes in 1 easy step, eliminates manual insertion of wire into document 
  • Lightweight and portable 
  • Fast and easily setup 
  • Heavy duty all metal construction 
  • CE approvals

I am very satisfied with Masterbind's products! The Atlas 300 book binding machine along with Masterbind's digital printing service has helped my company create professional portfolios for our clients. Masterbind's Atlas binding machine is easy to use and has help my employees productivity by saving time and has helped my business save money and increase sales by up to 40%.

Albert WilliamsReal Estate Manager

Masterbind USA's  knowledge and experience with book binding was very helpful for me and my company. We use their hardcover books in linen for our company reports and client portfolios. Masterbind was able to create a customizable cover for us that was professional and unique to our brand. I highly recommend using their services!

GG MitrescuProduct Manager

I recently purchased the Masterbind trimmer stand alone unit for my printing company. We attached it to our roll laminator from Royal Sovereign and use it for our medium to larger runs. The adjustable slitting blades and time sensors are well worth the purchase.

Daniel HumphriesOwner | CEO

Product Manual

Product Data Sheet

Operations Video

Warranty Information

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Masterbind selling Rhin-O-Tuff Paper punch machines for home offices, businesses, and schools. Automatic, fast, and affordable machines delivered right to your door.


Rhin-O-Tuff Onyx HC8318 18" Semi-Automatic Wire Inserter and Closer

ONYX HC8318 Features

  • Inserts & Closes in 1 Easy Step
  • Eliminates Manual Insertion of Wire into Document
  • Closes 3-1 Double-Loop Binding Wire
  • Binds documents up to 18 inch
  • Binds Split Wire with Calendar Hanger
  • Lightweight and Portable
  • Slide-out Table Extension for Larger Documents
  • Easy Operation



Rhin-O-Tuff Onyx HD8000 14" Manual Flat Bar Wire Closer

ONYX HD8000 Features

  •  Reversible binding handle
  • Exclusive reversible top closing bar
  • Optional raised front feet
  • Wire compatibility from 3/16 inch to 1 1⁄4 inch
  • Wide 14 inch throat for an open-ended design
  • Stand-alone operation or mount
  • Durable all-metal construction
  • 3 Year Warranty


Rhin-O-Tuff Onyx HC8024 24" Manual Flat Bar Wire Closer

ONYX HC8024 Features

  • Closes 3/16” to 11⁄4” (5mm to 32mm) Twin-Loop Binding Wire
  • 24” (610mm) Binding Edge
  • Easily Adjustable for Wire Sizes
  • Lightweight and Portable
  • Slide Out Table Extension for Handling Long Documents 
  • Easy Operation at any Wire Size


The Rhin-O-Tuff Onyx HD8370 Insert-A-Bind Wire Inserter & Closer closes 3:1 pitch double loop Wire-O® in one easy step, eliminating manual insertion of wire into documents.

ONYX HD8370 Features

  • Eliminate the manual insertion
  • 3-1 Pitch double-loop binding wire closer
  • Can be attached to any Rhin-O-Tuff OD or HD
  • Superior lightweight 
  • Semi-Automatic Wire Inserter