535 of a length of about 0 125 u2033 and a height of about 1 375 u2033 at the first end 537 of the triangular area 531 the flat area is at a level about equal to the outer circumference of the transition point 507 at the base 535 of the triangular area 533 the flat surface has been cut into the surface of the first body segment 509 about 0 0625 u2033 creating the intersecting wall area 533 extending from the face of the third acute triangular shaped flat area 531 is a fourth short fin 532 of like shape and angled placement as the first short fin 520 the second short fin 532 preferably extends outward from the face of the third triangular shaped flat area 531 about 0 057 u2033 and preferably is about 0 625 u2033 long and about 0 04 u2033 in width extending from a sharpened point 532 a beginning at the first end of the triangular shaped area 519 adjacent the transition point 507 and extending generally along one side of the third triangular shaped flat area 531 the second short fin 532 terminates about mid way along the length of the third triangular shaped flat area 531 the angular nature of the fins 511 amp 513 and the short fins cause the connector to rotate as it is inserted into and through the insulation layer and into the concrete layer this rotation permits the insertion.