I have today become the proud owner of a 110mm core bit together with hex arbor, which I purchased from Toolstation. The kit also included what looks like on off-set flat screwdriver bit (some king of wedge, maybe?), but no guide bit. Rather than incur further carriage charges, I thought I might nip into B&Q for one, but how do I know what size to get? Also, do I need anything else to make this thing work properly?
Dave.