BIG TIMBER® Bronze T-30 Lag Screw, 25-Count Bucket, CTX154-25, #15 x 4 IN

The CTX screw features a bronze coating, perfect for your exterior or interior projects. The star drive handles 2X the torque as Phillips or Square Drive while extending the life of the bit. Under-head cutting nibs aids in self countersinking. It has an aggressive knurl that enlarges the hole to reduce splitting and drag to help draw lumber together. The type 17 tip helps give it faster precise starts which eliminates "walking" and allows for easy insertion without pre-drilling. This product is backed by certified independent testing (TER 1907-01).