Heavy-Duty Pre-Plated Steel Mounting Strap for Maximum Strength;All Screws are Brass Combination-Head for Fast Installation with Standard, Phillips, and Robertson Head Screwdrivers;External Clamp-Type Wiring Terminals Provides Secure Connection of Solid or Stranded Wire for Back or Side Wiring (CSB1 and CSB3);Backed by a Limited Ten-Year Warranty;Listed UL Federal Specification, WS 924