each wedge segment 32 is inwardly tapered from top to bottom as shown at 38 expansion shell 28 further includes a cone or wedge nut 40 having an axial threaded bore 42 for threaded engagement with threaded bolt part 26 the outer surface of cone nut 40 is tapered inwardly from a point near the top to its bottom thereof as indicated at 44 for sliding engagement with the tapered wall 38 of wedge segments 32 diametrically opposite side edges of cone nut 40 are cut away to provide longitudinal grooves 46 and 48 for purposes which will hereinafter be more fully set out in accordance with the present invention there is also provided an inverted u shape bail member generally designated 60 which extends upwardly from expansion shell 28 bail member 50 is preferably made of relatively rigid material of uniform width and thickness and includes a pair of like spaced legs 52 and 54 the upper ends of which lie within grooves 46 and 48 of cone nut 40 to insure proper engagement with the latter the upper ends of legs 52 and 54 are joined by a connecting portion 56 which overlies the cone nut at a point intermediate their length legs 52 and 54 are bent inwardly at an angle 34 a 34 to provide inwardly bent portions 58 and 60 for optimum results bent portions 58 and 60 extend at approximately a 5 u00b0 angle to the main portions of legs 52 and 54 the lower limits of bent portions 58 and 60 issue into outwardly bent portions 62 and 64 the ends of which are welded or secured in any suitable manner to diametrically opposed portions of wedge segments 32 as indicated at 66 and 68 as shown in fig2 and 4 inwardly bent.