Abstract: This invention relates to slot milling tools and the like where a number of inserts (4) are detachably mounted at the periphery of a disc shaped carrier means (1). The seats (3) of the inserts are arranged within integral holding projections arranged and shaped relatively to the intended positions to the inserts that on operation the radial component of the cutting force biases the holding force acting against the insert so that it increases on increase of cutting force. This is achieved by arranging at the essentially radially projections (7) an obliquely located nose portion (8) engaging the insert.