🔧 Screw it, install it, own it! Serrated hex washer head prevents back-out for lasting stability. No assembly required; ready to install right out of the box. Experience easy installation with low torque threads. Cuts its own threads into concrete for a seamless fit. Use a standard bit size that matches the anchor diameter. 3" length 25 screws per box 3/8" diameter The CONFAST LDC383 is a high-performance concrete screw designed for anchoring to masonry, brick, or block. With a 3/8" diameter and 3" length, this zinc-plated screw comes in a box of 25, featuring a low torque thread design for easy installation and a serrated hex washer head to ensure a secure fit.