Provides stable footing to prevent Clamp-It® Bar Clamps falling during glue-up. Attachments snap securely onto both ends of clamps (sold separately). Mounting holes mean clamps can be screwed in position. Raises clamp height to give more knuckle clearance when tightening. Includes two sliding spacer attachments, which slip onto bar to centre thinner stock between jaws, keeping it flat and properly aligned when pressure is applied. Ideal aid when building smaller projects. Integral storage hook for hanging clamps when not in use.