1The cast iron material with high strength is coated with a thick layer of paint, which ensures corrosion resistance. 2This square tenon transform tool can effectively improve working efficiency as well as simplifying the operation. 3An excellent accessory that suitable for converting woodworking bench drill to square tenon drilling machine. 4With a small size and a light weight, the square tenon converter can be conveniently installed on machine. 5Stable structure is not easy to deform, very durable for long term use and very easy to carry as well. Item Type: Bench Drill to Square Tenon Converter Material: Cast Iron 1 x Bench Drill to Square Tenon Converter 1 x Reduction Sleeve 1. Please select 40MM, 53MM, 55MM, 58MM, 60MM, 65, 75MM reducing sleeve according to the outer diameter of your bench drill. 2. The diameter of the self provisioning knife sleeve handle must be 19 mm. If necessary, please equip yourself with a suitable reducing sleeve.