Providing longer life and fastest and easiest possible means of changing from disc to disc, these paper backed abrasive discs are laminated to a material which will adhere securely to a Velcro® backing pad. Discs go on and pull of with a very light touch. Added product life and ease in handling make them cost efficient in many applications. TouchLock Disc Holders Touchlock (Velcro back) Discs Sizes, Material Specs and Availability TouchLock discs are available in diameters 1" through 8", alghough they are most commonly used in the 5" to 8" diameter range. The most common material specifications is:   B317   Heavy weight paper for finishing applications on metals and woods.     Grain: Aluminum Oxide     Coat: Open     Bond: Resin/Glue     Weight: F     Backing: Paper     Water Resistant: No     Grits Normally Stocked: 220, 180, 150, 120, 100, 80, 60, 40, 36   SCLU   For finishing wood, plastic, fiberglass and other materials where loading can be a problem.     Grain: Silicon Carbide with zinc stearate     Coat: Open     Bond: Resin/Glue     Backing: Paper     Water Resistant: No     Grits Normally Stocked: 400-A, 320-A, 280-A, 240-A, 220-A, 180-A, 150-A, 120-A, 100-A, 80-A, 150-C, 120-C, 100-C, 80-C, 60-C