Qual Craft 4 inch 90 degree Fixed Roof Bracket. Durable all steel construction. Easy installation and removable without damaging shingles. OSHA compliant when installed according to instructions. Capacity: 1 man per 8 ft. of staging plus 40 lbs. Maximum 8 ft. spacing between brackets. Use 2 in. x 6 in. or 2 in. x 4 in. planks as specified.