Cardinal Gates Square Clamps are an excellent option for mounting your safety gates. No need to drill holes or screw into your fine woodwork. Crafted from solid poplar, Cardinal Gates Square Clamps will work only with square posts and banisters (round clamps available, sold separately) to ensure proper, secure mounting of our safety gates. Post size must be 1 1/2 minimum to 3 3/4; maximum in width. Are your posts larger or smaller than this? No problem. You can purchase 1/4"-20 hex head bolts at any hardware store to use with these clamps. Typically, two clamps will be needed per side of gate. One clamp per pack; each sold separately. Cardinal Gates Square Clamps are unfinished wood—paint or stain to suit your décor. Made in the USA.