All of UNION steel wire brushes and abrasive nylon brushes specifications can be assigned to satisfy universal uses with various brands key copy machines. 2. UNION key machine abrasive nylon deburring brush made with silicon carbide impregnated filaments that swiftly and smoothly deburrs on a newly cut key. 3. UNION key machine abrasive nylon is the safest filament help prevent pulling keys out of your hand and drawing down inside the brush cover. 4. Specially developed UNION deburring wheel brush is highly durable, easy installation and easy handling. 5. Available in all filaments equipped with various brands key copy machines.