2pcs set: Includes 1 x M14 SDS Plus threaded shank adapter for diamond drill bits and 1 x M14 threaded triangle shank adapter for diamond drill bits. Application: M14 threaded drill bits can be installed on impact drill, electric drill or bench drill with SDS shank or triangular shank. WIDE APPLICATION: Drill adapter for granite, concrete, glass, brick. With this adapter, you can easily adapt the diamond drill bit of your granite or diamond hole saw to a variety of applications. Note: The data is all measured manually, there may be 1-3cm deviation due to light and display differences, please refer to the actual item you received.