This set of four, 75mm long sanding drums will help you get more use out of your pillar drill or woodturning lathe. The drums are a resilient rubber fitted with an abrasive sleeve. Turning the nut located on the base of each drum, slightly expands the rubber and secures the abrasive sleeve. The diameters are: 25.4mm (1"), 50mm (2"), 63mm (2.1/2") and 75mm (3"). Partially used sleeves can be removed and kept for use at a later date. The drums come with two sets of sleeves, 80 grit and 120 grit. Replacement sleeves are readily available. Each drum has a 12.5mm shank. Maximum recommended speed 1,500rpm.