24 The tool - free, twist - on and off fastening   systems make fast work of disc changes   to maximize productivity by minimizing   downtime . Typical Applications:      Fibre Discs           • Weld grinding and blending           • Heavy metal removal           • Light deburring and finishing      Cloth Discs           • Light to medium pressure grinding           • Blending, leveling and finishing applications           • For use on contours or flat surfaces Norton Speed - Lok TS and TR Discs Features: Benefits: • Speed - Lok fastener • Quick, tool - free disc changes allow for more grinding time • Twist on and twist off in 2 - 1/2 turns • Disc locks securely to back - up pad, but is easily removed • 1” – 3” TS discs – all - metal fasteners • Mount to the Norton Speed - Lok TS   Quick Change back - up pads • 1 - 1/2” – 2” TR discs – rubber threaded hubs • Mount to Norton TR or 3M Roloc back - up pads BETTER    NorZon Plus R821 Cloth Discs – For grinding and deburring stainless steel Features: Benefits: • Self - sharpening, zirconia   • Cooler cut, longer life   alumina abrasive • Heavy Y - wt backing, two - ply   • Extended durability   construction • Reduced edge - wear GOOD    Metalite R228 Cloth Discs – Metalworking, versatile Features: Benefits: • Premium aluminum oxide abrasive • Long life • Heavy - weight cloth construction • Excellent durability • X - wt cotton backing • Ideal for aggressive stock removal applications • Resistant to heat