Senco DuraSpin #2 Square Bits DS310/325AC/340AC, TY0300/2503/4003 - EA0272 Senco DuraSpin #2 Square Drive Bits Approx. Length: 7 1/4" Quantity: One pack of 2 For Duraspin DS310, DS325AC, DS340AC and Tyrex TY0300, TY2503, TY4003