When you're drilling deep holes and your drill bit just isn't long enough, this Starrett extension bar is the tool you need. It's a simple but super useful 250mm (about 10 inches) long steel rod that screws directly onto compatible Starrett arbors. Specifically, it fits the BMA1 (115mm) and BMA1240 (240mm) hexagon adaptors. Screw this extension onto the arbor, and you add an extra 250mm of reach – so with the BMA1, you get 365mm total, and with the BMA1240, you get a whopping 490mm! Then you screw your diamond core drill bit (hole saw) onto the end of this extension. It's made from high-quality steel, so it's tough and won't wobble, giving you better control and accuracy when drilling deep. It's a must-have for electricians, plumbers, or any DIYer who needs to drill through thick walls, floors, or beams. It comes in a handy plastic case for storage. Just remember, this is just the extension bar – you'll need the compatible Starrett arbor and core bit to use it. Makes those deep, clean holes possible without buying a whole new long drill bit.
