that they even engage the surrounding tubular this is because the anchoring is accomplished substantially by the insert s 6 as before the shoulder 56 can act as a travel stop but it is more likely that the cone 2 will stop well before reaching shoulder 56 as the inserts 6 penetrate the surrounding tubular tab 52 is retained by retaining nut 14 that is further held on with a set screw 16 those skilled in the art will appreciate that the illustrated plug designs can be used for treating operations at a subterranean location such as fracturing injection acidizing or conditioning the formation for production among other uses in the fig1 embodiment the plug is fully disintegrating after use as it is made from disintegrating materials that respond to well conditions created after use so that no residue remains for the subsequent operations or to injure other equipment that is in the vicinity the plug can permit some leakage and still be useful for operations like fracturing even with a plurality of ribs that friction grab the surrounding tubular rather than penetrating the surrounding tubular additional anchoring can be obtained with adding more ribs but it has been determined that hardened inserts are not mandatory for functionality in fracturing service an elongated rubber seal is also not needed if some leakage flow is tolerated the advantage is the full disintegrating capability of a plug made from such materials in its entirety on the other hand fig2 represents a design.