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. Offsets available from 1-1/8" to 1-5/8" offset.