The Hillman Group 852120 Heavy Duty Long Stem Steel Wheel Roller, Zinc Plated Heavy duty long stem replacement roller for most residential sectional garage doors Specifications: 1-7/8" roller, 7-9/16" stem, 7/16" shaft Steel Material/Zinc Plated WARNING: INCORRECT INSTALLATION OR DOOR POSITION CAN CAUSE SERIOUS INJURY OR DEATH See package warnings and enclosed instructions