The Systainer M 125 mm Abrasives Insert is a vacuum formed insert designed to store 125 mm diameter abrasive discs in 5 divided compartments. It also works with 80 x 133 mm rectangular pads and 100 x 150 mm delta pads. This unit is designed to fit in a Systainer³ M 112, it doesn't fit in the T-Loc generation as is.