When you want to avoid drill bit slip outs, there's no better type than a square drive bit. Senco Square Drive Bits are designed to avoid cam-out and minimize marring to help with continued use. These drive bits come together in box sets and are specially made to provide peak performance when used with Senco Duraspin Screw Gun. And, they're made to be durable enough for everyday use by professionals. When you need drive bits for your Duraspin screw gun, get Senco Duraspin Drive Bits.