Flush Hatch Lift with back plate fits flush into plate which can be recessed into the hatch. Stainless steel hinge pin. Locking arm height is adjustable which is secured with set screw. Finished in Polished 316 Stainless Steel. 2-5/8" OD and 2" hole diameter· Overall Height: 3" · Range of Locking Adjustment: 1-1/4" to 2-3/4"