Stainless Steel Butt Hinge, 4-1/2 x 4, Type 316 C10122 Square holes are designed to

Square holes are designed to work with carriage bolts

Strap width is 1"

this pull is in fact through-bolted from behind at 3-3/4" center-to-center

The 3-1/2"x3-1/2" and 4-1/2"x4" hinges include wood screws

Stainless Steel Butt Hinge, 4-1/2 x 4, Type 316 C10122 Square holes are designed toHeavy duty stainless steel butt hinge made from Type 316 Stainless Steel (Investment cast). Type 316 Stainless Steel is a high grade stainless steel, also known as Marine Grade Stainless Steel. Hinge features a non removeable hinge pin and integral nylon bearings for a silent no rattle movement. May be surface mounted or installed as a full mortise butt hinge. If installed as a full mortise butt hinge, the door thickness range is 1 3 8" to 1 3 4".