Strong and comfortable grip . Allows two-handed power blocking on large panels . Designed for use with 2-3/4" PSA rolls or standard sheets of abrasive paper. Large flat or slightly curved panels can be blocked in a fraction of the time. Features three layers of engineered materials that permit just the right degree of flexibility Hand sanding just got a big power boost with the introduction of the Big- Block from Motorguard. When extra power is needed, the Big-Block is the answer. The unique design features three layers of engineered materials that permit just the right degree of flexibility to ensure even pressure over the large, flat sanding surface while eliminating heat transfer to the hand. The exclusive, rounded top edge provides comfort while the soft center layer provides a finger recess for a superstrong grip. Flip the block over and the rounded edges can be used to power sand contours and recesses without the pressure points that come from sharp corners.