Bathroom Drain Hole Knockout, Reusable Rubber Plug

Bathroom Drain Hole Knockout, Reusable Rubber Plug Re-usable Polyurethane Drain Hole Knockout. Place on a sink mold to create a hole for the drain. Creates a 1-1/2" diameter hole, 1" deep, and then flares out to a 2-3/4" diameter that is 1/4" deep.   Shape of the Drain Plug has a larger diameter hole on underside of the concrete to allow room for mounting brackets of drain hardware. Slightly angled sides to allow for removal from the finished concrete. Made of extremely durable Polyurethane. Good for hundreds of uses. Specifications- Bathroom Drain Hole Knockout, Reusable Rubber Plug: Measurements: 1 1/2" Tall, 1 1/2" Diameter Hole x 2 3/4" Diameter (Mounting Hardware Area) Bathroom Drain Hole Knockout, Reusable Rubber Plug Use and Care: Secure Knockout in place with a small dab of silicone. Apply Form Release (sold here) to the rubber knockout before pouring the concrete around it to make removal easier later. Removal- Prior to flipping over your cured concrete, loosen the e