Brand: Sunex Manufacturer's Part Number: 310ZRD Part Type: Sockets and Drive Bits Product Line: Sunex Tools Impact Sockets Summit Racing Part Number: SXT-310ZRD UPC: 613364130537 Socket/Bit Style: Standard Impact Rated: Yes Number of Pieces Included: 1 Socket/Bit Piece Count: 1 Ratchet Included: No Extensions Included: No Swivel Extension Included: No Socket Material: Chromoly Socket Finish: Black Case Included: No Quantity: Sold individually. Notes: Semi-deep impact socket. Socket Drive (Application): 3/8 in. Deep Well Socket Size: 5/16 in. Deep Well Socket Type: 12-point Sunex Tools Impact Sockets Sunex Tools impact sockets are machined from chromoly steel with a protective black finish for long life and dependability. Socket options include: standard or metric; drive size; deep well socket type and sizes; short well socket type and sizes. Some sets also contain extensions. Sunex impact sockets are available individually―or in various sets with a heavy-duty， blow-molded storage case.