Uses T30 Torx Drill; We have inspected all lag screws and wood screws you receive with your purchase The quantity not be insufficient. Internally constructed lag screws replace traditional lag screws or frame bolts. Heat Treated Level 5 Durability, screws are heat treated to increase strength and reduce breakage. The retro-convex screw's improved truss washer head design provides a modern and stylish finished installation. Excellent tensile strength eliminates the need for separate washers, providing superior clamping capabilities and easier installation. These screws are yellow galvanized for durability and have heavy duty shanks for increased torsional strength. They also have an asymmetrical thread for improved pullout strength and a point for quick start. Common applications include decks, stairs, play sets and many other outdoor wood projects. Fixing screws according to size can efficiently find the required screw size. Screws are sized to match for everyday use. Type:Torx Round Washer Flange Screw Quantity:100 Pieces Colour:Gold Material:Metal Size:1/4 x 3-1/4In Package Contents: 1set * lag screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.