The BlueSpot 7Pce Mixed Extension Bar Set (1/4″ 3/8″ 1/2″) is drop forged from heat treated chrome vanadium steel with a high shine chrome finish. The spring ball socket retainer is secure and suitable for 1/4″, 3/8″ and 1/2″ ratchets. Deep knurling for increased grip. Set includes: 1/4″ (2″/4″/6″), 3/8″ (3″/6″), 1/2″ (5″/10″). Manufactured from heat treated chrome vanadium steel for increased durability.