Item Type: Drill Chuck Arbor Model Number: MT3-1/2-20 Material: Manganese steel Thread Specification: 1/2in, Length: Approx. 20mm / 0.79in Connecting Rod: Morse MT3 Connection Mode: Screw Package List 1 x Drill Chuck Arbor 1OXIDANT RESISTANT STEEL: Drill chuck arbor is made of excellent manganese steel material, surface quenching blackening treatment, possess high oxidation resistance, high hardness, long service life 2EASY REMOVAL: Drill chuck mandrel allows quick and easy installation and removal, saving you time when switching between applications 3WIDE APPLICATION: This high accuracy drill chuck mandrel is widely used in tapping machine, drilling machine, milling machine, boring machine, pneumatic tools, etc. 4THREAD SPECIFICATION: This drill chuck arbor is a 3MT shank to 1/2in20 threaded hardened morse taper MT3 adapter, useful and practical 5EXCELLENT PERFORMANCE: Drill chuck arbor adapter is made with fine workmanship, possess compact appearance and stable performance, can make sure durability and stability