Review on 🔧 Alfa Tools FB61493 Forstner Drill Bit Extension by Eugene Cox

Heavy Duty Drill Extension. It is 5/8" in diameter with a 3/8" hole on one end and a 3/8" shank on the other end. It weighs 12.0 ounces, not 1.9 ounces as stated in the description. It also has 4 set screws to hold the bit in place instead of the usual 2. This is great when you need to reduce vibration when extending the bit. Note: the hole is actually 10mm (.393" not .375"), but it works fine with 3/8 bits. Worth the extra cost.