3 1/8″P x 3 1/8″W x 7 3/4″H, Inside Corner for Moulding Profiles Less than 3 1/8″P and 3 7/8″H

3 1/8″P x 3 1/8″W x 7 3/4″H, Inside Corner for Moulding Profiles Less than 3 1/8″P and 3 7/8″H