MasterMind 800331 Lock-On and Hold Hex Nut Driver Imperial Two Piece kit includes 1/4-inch and 5/16-inch by 10-inch and locks onto hex screws with an internal locking mechanism that secures the grip. With a lever that engages and releases the hex screw, the Hex Nut Driver is great for tight, hard to reach places. It's great with hose clamps.

*NOTE* This is the same model from SMC as the "Master Mind" brand, however with different packaging. As you will see from the pictures, it is the same model number, only before the SMC company renamed it to "Master Mind" *NOTE*