The present invention relates to an indexable insert (1) for installation in carrier tools for machining workpieces having a top (2) and a bottom (3) and having a circumferential geometry (4) connecting the top (2) and bottom (3), wherein cutting corners (5) and cutting edges (6) are disposed at the transition from the top (2) and bottom (3) to the circumferential geometry (4), and the circumferential geometry (4) on both sides comprises peripheral positive clearance surfaces (7a, 7b) beneath the cutting corners (5) and cutting edges (6), said surfaces being retracted in relation to the cutting corners (5) and cutting edges (6), thereby creating a positive clearance angle (a) on both sides. In order to enable the use of the indexable inserts (1) in conventional tool holders, without forfeiting the characteristics and advantages of a positive clearance surface, according to the invention a collar (8) that is raised compared to the lowest points of the clearance surfaces (7a, 7b) is disposed between two clearance surfaces (7a, 7b) opposing each other on the circumferential geometry (4) with respect to the top (2) and bottom (3), the surface (9) of said collar serving as a contact support in carrier tools.