Ramset's Powder-Actuated Drive Pins can be used with most powder actuated tools that fire .22 cal low velocity charges as well as .27 caliber strip loads and .25 caliber disc loads. Ramset Drive Pins are available with an attached 7/8 O.D. 16 gauge round steel washer when a can be used with most powder actuated tools that fire .22 cal low velocity charges as well as .27 caliber strip loads and .25 caliber disc loads. Ramset Drive Pins are available with an attached 7/8 O.D. 16 gauge round steel washer when a larger bearing surface area against the fastened material is necessary.