Bird B Gone Eye Bolts are a high load bearing expansion bolt ideal when anchoring into masonry, concrete and stone surfaces. Eye bolts are used as a corner anchor when installing cable perimeters. Net Bolts are offered in two sizes: medium for cable runs under 100’, large for cable runs over 100’. Medium bolts (M6) require a 10mm drill bit, while the Large bolts (M8) require a 13 mm drill bit. Once the pilot hole has been drilled, hammer the bolt in place then twist and expand the bolt to secure. Eye bolts come in galvanized or stainless steel material. 10 per pack