TruBuilt 1 Automotive 7 Piece Lambda Sensor / Oxygen O2 Sensor and Oil Pressure Sending Unit Master Socket Set - HEAVY DUTY PROFESSIONAL GRADE SUPERIOR DESIGN: For the universal removal and installation of oxygen sensors, oil pressure sending units, and vacuum switches HEAVY DUTY: Heat treated and hardened black chrome vanadium steel socket and wrench set GUARANTEED: Full 1 year warranty and 30 day money back guarantee. Requires either 3/8" or 1/2" (depending on socket size) square drive ratchet 7 PIECE SET: Includes: (1)- 7/8" (22mm) O2 socket, offset double hex crows foot - (1)- 7/8" (22mm) O2 socket, low profile offset crows foot - (1) 7/8" (22mm) (6 point) slotted 3/8 drive O2 socket (3" long) - (1) 7/8" (22mm) O2 sensor/ vacuum switch socket (3.5" long) (1) 1-1/16" (27mm) oil pressure sending unit socket (deep well allows for up to 2-5/8-in. (67-mm) clearance) 3/8" drive - (1) 1-1/16" (27mm) (12 point) GM thermal sender socket, 1/2 drive (3" long) - (1) 1-3/16" (29mm) (6 point) 1/2 in drive GM oil sender socket