These are blocks of solid buffalo horn patterned after originals from the turn of the century. After disassembling your double gun the striker block was held flush against the standing breech and the triggers pulled thus "letting down" the firing pins against the block and placing the mainsprings at rest. A must for every gun case or cleaning kit. Sizes are approximate as each is hand made and our newer models have smooth rounded edges, not hard edges as shown. A real bargain at our special sale price!