Specification: M8*100 (bolt diameter 6MM, screw length 100MM) Quantity: 2PCS Made of 304 stainless steel, it is durable and can be used outdoors. It has better rust resistance (Can be used in damp or water and will not rust). Hole size: Select an impact drill bit of the same diameter as the tube expansion screw and install it on the electric drill to drill the wall, the depth of the hole is the same as the length of the bolt. The expansion tube should penetrate into the wall and as long as the threaded part is long enough, the sleeve part is deeper and firmer. It should be noted that the expansion screws should be mounted on a relatively rigid substrate. The resistance to traction installed in concrete is five times that of bricks. Material: stainless steel Color: Silver Size: M8x100 < p>Size Details(mm): Bolt Diameter x Bolt Length (Length excluding bushing) Package includes: 2 x Expansion Bolts Application - Widely used in fences, burglar-proof doors and windows, canopy, air conditioning fixing, furniture, construction fasteners, etc. Easy to install - Drill a hole, place the screw expansion hole, use a wrench to tighten the expansion bolt nut outside the hole. Installation method: - Use a drill bit to drill a hole of the same diameter as the expansion tube on the wall. - Place the expansion screw into the floor or hole.< /p> - Use a wrench to tighten the expansion bolt nut outside the wall hole. Notice: - Please keep it away from children. - Manual measurement may have a difference of 1-3mm.