Battenfeld Universal Bench Block 672215For firearm assembly and disassembly, the Universal Bench Block is your best friend.It features a variety of notches, grooves, and holes on both sides and is ideally suited for M1911-style pistols. Need to install a pin, detent, or spring? The Universal Bench Block is the answer. 1-5/16" high, 4" in diameter.Non-marring urethane for long use.