The Resistors are born through our collaboration with the Power Company and are shaped by Kris Hampton. Kris and the team at the Power Company are obsessed with making climbers better through training material, standard training plans, and custom training plans. The Resistors are shaped for climbers that need to train footwork around precision, and trust. For more info on the Power Company check out https://www.powercompanyclimbing.com/ Using general construction screws, drywall screws, or any non-structural screw can be dangerous when installing climbing holds. GRK #9 screws have a structural rating (#8 GRK do not) and are the only screws we recommend for installing climbing holds. Safely installing holds is important with precious hands pulling pulling on these plastic grips. All holds should be attached with socket head bolts and all available set screws.