Large cam lift hinge is designed for installation where irregular floors interfere with operation of doors. Ductile iron cam rotates on a hardened roller bearing to lift the door, eliminating sag. Hinge is reversible for left or right hand doors. Maximum lift is 1/2". Holes in strap are drilled and countersunk for 3/8" bolts. Cam and bracket are ductile iron, strap is steel. No. 303-HC Hinge only has a longer leaf. Has ductile iron cam and bracket with a steel leaf. The 303-C hinge with a 2-7/8" wide strap. Maximum 1/2" lift. Offsets available from 1" to 1-5/8". Specify offset required.