Master Nut Bolt & Screw Extractor Set 56pcManufactured from Chrome Molybdenum hardened steel. Easily extract nuts bolts and screws that are rusted worn painted over or even completely stripped or broken. Internal thread with reverse spiral flutes for superior grip on damaged bolts providing excellent torque. Includes standard 1/4 and 3/8"Sq drive hex adaptors allowing the use of hand air or power tools. Includes three knock-out pins for easy removal of damaged bolts and nuts once removed. Supplied in storage case for easy transportation.Features CHROME MOLYBDENUM STEEL – Hardened and tempered for strength and durability. KNOCK OUT PINS – For easy removal of damaged nuts and bolts. EASILY REMOVE BROKEN NUTS – Extract nuts bolts and screws that are rusted worn painted or broken. REVERSE SPIRAL FLUTES – Allows for secure grip on damaged bolts. CONTENTS - 16pc Nut/Bolt Extractor Set - 1/4" Sq Drive; 1/4” 8mm(5/16") 3/8" 10mm 11mm(7/16") 12mm 1/2" 13mm 14mm(9/16") 16mm(5/8") 11/16" 1/2" Sq Drive; 17 19 21 22 24mm 25pc Screw Extractor Set - 1/8" 5/32" 3/16" 7/32" 1/4" 9/32" 5/16" 11/32" 3/8" 13/32" 7/16" 15/32" 1/2" 17/32" 9/16" 19/32" 5/8" 21/32" 11/16" 23/32" 3/4" 25/32" 13/16" 27/32" 7/8" 5pc Spiral Flute Screw Extractor Set - 4 5 6.5 8 11mm 5pc HSS Drill Bit Set - 2 3 4 6 7mm 3/8" Hex Socket Adapter 1/2'' Hex Socket Adapter 3pc Reversible Knock-Out Pin Set - 5-10 7-12 10-10mm. SUPPLIED IN CASE – For easy transportation and storage.Specification Manufactured from Chrome Molybdenum hardened steel. Easily extract nuts bolts and screws that are rusted worn painted over or even completely stripped or broken. Internal thread with reverse spiral flutes for superior grip on damaged bolts providing excellent torque. Includes standard 1/4" and 3/8"Sq drive hex adaptors allowing the use of hand air or power tools. Includes three knock-out pins for easy removal of damaged bolts and nuts once removed. Contents: 16pc Nut/Bolt Extractor Set - 1/4" Sq Drive; 1/4” 8mm(5/16") 3/8" 10mm 11mm(7/16") 12mm 1/2" 13mm 14mm(9/16") 16mm(5/8") 11/16" 1/2" Sq Drive; 17 19 21 22 24mm 25pc Screw Extractor Set - 1/8" 5/32" 3/16" 7/32" 1/4" 9/32" 5/16" 11/32" 3/8" 13/32" 7/16" 15/32" 1/2" 17/32" 9/16" 19/32" 5/8" 21/32" 11/16" 23/32" 3/4" 25/32" 13/16" 27/32" 7/8" 5pc Spiral Flute Screw Extractor Set - 4 5 6.5 8 11mm 5pc HSS Drill Bit Set - 2 3 4 6 7mm 3/8" Hex Socket Adaptor 1/2'' Hex Socket Adaptor 3pc Reversible Knock-Out Pin Set - 5-10 7-12 10-10mm. Supplied in storage case for easy transportation. Model No. AK8156PTDSEAAK8156"