Product Description 6 Pack M6 304 Stainless Steel Expansion Hook Heavy Duty Concrete Wall Hook Open Cup Hook Expansion Bolts for Concrete Wall FEATURES: Solid structure expansion hook can bearing a large amount and strong tensile strength. Heavy Duty hook screw bolts, used in concrete, brick walls, fences and masonry. Both use indoor & outdoors - Durable, wear-resisting, rust resistance and corrosion-resistant. Widely used in fence, burglarproof doors and window, clotheslines, canopy, air conditioning fixation, home decoration, engineering, rigging & anchoring hardware etc. Noted - the expansion bolts must be mounted on a relatively hard substrate, and the place where the soft and easy to fall off is unstable, such as the gap of the lime soil of the wall. M6 Expansion Hook Specifications: Color: Silver Material: 304 stainless steel Total length: 2.7in/90MM Expansion tube length: 1.2in/40MM Punch drill bit (diameter): 0.3in/9.5MM