To use the Plastic Scissor Gate you must drill an 1-1/2 inch hole in the side of the bucket. The gate will be tight when you screw it into the bucket. You may drill a bigger hole (1-3/4) but the hole will not be as tight. The larger opening will still allow you to get a good seal around the gate. Gate comes with a nut to attach to the hole in the bucket. (Adjustable gate, clean cutoff, durable high strength plastic.) 1-1/2″. Colors may vary.