Simpson 12d x 3 1/4" 31°-34° Paper Tape, Clipped Head, Ring-Shank Nail 304SS 250PkModel No. S325T31250 Coating Material. Type 304 Stainless Steel Gauge. 10 Penny size. 12d Length (in.) 3 1 4 Shank Diameter (in.) 0. 131 Shank Type. Annular Ring Shank Head Type. Clipped Head Head Pattern. Smooth Head Point Type. Diamond Point Packaging Qty. 250 These smooth, clipped head nails feature an annular ring shank for increased withdrawal resistance and a secure attachment. Compatible with many major manufacturers' pneumatic tools. Key