The screws of the anchor have been manufactured under standaard and their quality-hardness is 6.8(i.e.60 to 80 Kgf/mm.) The washer is wide, which gives a bigger allowance for pleces or structures to be fastened. While performing the fixing of the anchor, the plastic ring gets deformed. which fills and blocks the hole of the plece ofr structure to be fastened;this plastics absorbs material irregularities, and-in addition-it is a useful damp-proof plece to inner mechanism of the anchor. Any screw head available as your requirement. The cone has some grooves(milled)in order to prevent the anchor from loose or spin movement after fixing into the hole and ready to expansion. Item