51 Piece 1/4″ Drive 6 Point SAE/Metric Socket Set includes 3/16″ – 9/16″ Standard and Deep Sockets; 4-5.5mm, 6-15mm Standard and Deep Sockets; 1/4″ Drive Full Polish Teardrop Ratchet, 1/4″ Drive Thumb wheel Ratchet, 2″ and 6″ Extension, and Universal Joint packaged in a blow mold case. Entry angle guides fastener. Serrated depth as deep as the fastener. Large hard stamped identification. Double line (SAE) and knurled line (Metric) to easily identify SAE vs. metric sockets. Made of 6130 Alloy steel and full polish nickel chrome plated.