Grip-Rite 12SKR30BK 12D 3-1/8-Inch Coated Sinker with Brite Smooth Shank, 30 Pounds 3-1/8-Inch, 10-gauge 5/16-inch diameter checkered countersunk head Vinyl coated smooth shank, for smooth driving 30 pound clear resealable bucket with handle Approximately 81 per pound Meets or exceeds appropriate ASTM and UBC specifications