Order this PRO-FIT 3-1/4 in. (16D) Vinyl Coated Sinker for delivery. Coating: Vinyl coated for interior use. Code: Made to conform to ASTM F1671. Applications: Designed for use in construction, carpentry, and framing. Head Style: Checkered, flat, countersunk head offers a large striking point that keeps the hammer from slipping. Shank Style: Smooth shank provides excellent holding power and are fast and easy to drive. Point Type: Diamond point starts fast and drives easily. Length: Nails are 3-1/4 in.