100 grit pump sleeve for the Hand-Held Pneumatic Drum Sander (Item number WK45940). Size 4" x 3-1/2".
About the Hand-Held Pneumatic Drum Sander:
Perfect for hand contouring and smoothing projects that are too large to use with a stationary sander. Simply chuck the 3/8" spindle into a portable electric, cordless or air powered drill for two-handed control.