Pemko CFM83SLIHD1 Continuous Geared Hinge Full-Mortise Heavy Duty Short Leaf Inset Clear Anodized Finish Fire Rated - UL10C - Positive Pressure, The Pemko CFM83SLIHD1 Designed for use with doors which range between 1-3/4" to 2-1/4", Pemko CFM Hinges are Designed for use with hollow metal frames where the inset conforms to S.D.I. specifications for aligning doors and frames, Fasteners are No. 12-24 x 7/16" FHUC, Type C, thread forming, no tapping required