• Threads are 3/8" - 16 to match pulley shafts. Power Tools. About JB Tools. Grey Pneumatic 1904M 3/8" Drive x 4mm Hex Driver Socket. Grey Pneumatic 2014M 1/2" Drive x 14mm Standard Socket. Grey Pneumatic 2524S 1/2" Drive x 3/4" Standard - 8 Point Socket.
