UwinVwin Square Hole Drill Bit Adapter with 4pcs Square Hole Drill Bit, Mortising Attachment for Drill Press, Mortise Machine, Power Tool Accessory for Drill Machines

Features

• [(Square drill bit adapter)] Fit for benchtop drill machine with hand drill clip diameters between 38 and 55mm (1.5 and 2.2 inches).
• [(Please Note)] This adapter is not suitable for lithium battery drills and bench drills without round bore bearings. Suitable for old table drills and household table drills, please pay attention before ordering.
• [(Material)] Square drill bit adapter is made of all-steel castings, which are strong and durable. If stored in a humid environment for a long time, it may cause some surface rust, which can be improved by simply wiping some protective oil.
• [(Drill bit diameter)] 1/4 Inch (6.4mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm), 1/2 Inch (12.7mm).
• [(Easy to Drill)] The carbide drill bit tipped is sharp and wear-resistant. With high hardness and long service life. The drill sleeve has a U-shaped design to facilitate the discharge of wood chips and improve the drilling efficiency.