Magna-Matic MAG-8200B System 9 Made in the USA Stage 2 employs a disposable

Stage 2 employs a disposable MERV 8 filter (minimum efficiency reporting value) which traps 70% - 80% of 3 -10 micron particles

The outside diameter is 8 5/8"

A great coarse stone for edges that are not damaged or allowed to get extremely dull between sharpenings

it measures 7-1/2" (190mm) long and closed it is 3-7/8" (99mm)

Magna-Matic MAG-8200B System 9 Made in the USA Stage 2 employs a disposableA Professional Belt Grinder Lawn Mower Blade Sharpening System with Dust Collection, Wheels and Light This kit (AKA Magna Matic System 9) has everything you need to professionally sharpen lawn mower blades with an abrasive belt sharpener. A 1hp grinder, blade balancer, and stand with all the attachments needed to mount everything. Choose Flat or Modular Worktable There are two variants of the System 9 to choose from: The MAG 8200B with Flat Work Table