1/2 x 7/8--------5/16 hole
1/2 x 1----------5/16 hole
1/2 x 1-1/8-----3/8 hole
1/2 x 1-1/4-----3/8 hole
1/2 x 1-3/8-----7/16 hole
1/2 x 1-1/2-----7/17 hole
1/2 x 1-5/8-----1/2 hole
1/2 x 1-3/4-----1/2 hole
Fitted in a plastic box