50 Large bolt on climbing holds with mounting hardware. The bolts and the t-nuts are included. These holds use a 2" 3/8 allen head bolt with a 3/8 T-nut. We make our climbing holds from recycled materials. We keep material out of land fills. ( A minimum of 550 pounds and 55 gallons a day). Rocky Mountain Climbing Gear is the only company in the world that makes holds from recycled material. What are they made of? Recycled materials including polyurethane, Vinyl Ester, Polyester, Plastics, Epoxy, Vegetable oil and other organic materials. These holds are nontoxic. Our holds are very strong and will stand up to any climate.Rocky Mountain Climbing Gear