DURABLE: This 9 piece 1/4” metric deep socket set is made from drop forged, chrome plated hardened steel for durability. CONTENTS: It includes nine 1/4", 6 point hex deep sockets in sizes 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm and 12mm and is supplied with a handy socket rail for storage.