Extension Bar for SDS+ electric/pneumatic hammer drills. If you need to core a deeper hole then this is what you need. Can also be used with standard percussion drills. PLEASE NOTE: Please check the Thread Size of your Core Drill before ordering as mistakes are at your expense! The thread size is: M16 2.0 Pitch Thread SDS plus Arbor 250mm long (327mm inc pilot drill). Includes 7mm masonry pilot drill bit. M16 2.0 Pitch Thread. PLEASE CHECK BEFORE ORDERING!. Ideal for light & medium density bricks, blocks and masonry. Brand: Toolzone. .