Hardened steel cut nails for fastening wood to concrete, cinder block, and masonry. The rectangular tapered shank wedges into the masonry as it's driven, gripping by friction along its full length and resisting pull-out far better than smooth wire nails. The blunt point minimizes spalling around the entry point, so the surrounding masonry stays intact.

• 10d penny size, 3" long
• Tapered rectangular shank for high pull-out resistance
• Blunt point minimizes masonry spalling
• For fastening 2x sole plates, doubled furring, and thicker stock to concrete or cinder block
• 1 lb box (approximately 70-80 nails)

Best for: 10d (3") is the right length when you need to reach through a 2x sole plate (1-1/2" thick) and still leave 3/4" or more of nail in the masonry below. Use it for partition wall plates, doubled furring strips, or stacked subfloor blocking on slab.

Tip: Drive with a heavy hammer (20-24 oz framing) at a slight angle and aim for 3/4" minimum penetration into the masonry. For dense or aged concrete, pre-drill a slightly undersized pilot with a masonry bit to keep the nail from snapping. Always wear safety glasses - cut nails are brittle and can shatter on a miss-hit.