The Allen 66636G is a 20 piece 1/2" drive tool set. Allen 66636G Features: 1/2" drive teardrop ratchet Ratchet extension 9 sizes of 12 point standard sockets: 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8" 9 sizes of 12 point metric standard sockets: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm Made in China

• Socket Type: Standard Length System of Measurement: Both, Metric Drive Size: 1/2in.
• 1/2" drive teardrop ratchet Ratchet extension
• 9 sizes of 12 point standard sockets: 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8"
• 9 sizes of 12 point metric standard sockets: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm

Socket Type: Standard Length System of Measurement: Both, Metric Drive Size: 1/2in.imported