is comprised of projections 176 and complementary openings 180 as best shown in fig2 each of the projections 176 includes a curved wall portion 182 fig2 and an upstanding support rib 184 fig1 each of the openings 180 is comprised of a t shaped slot including an elongate portion 186 and a transverse portion at 188 fig3 it should be appreciated that each of the projections 176 is receivable in sliding engagement with a corresponding opening 180 as will be further described herein with respect now to fig4 and 5 the grounding contact 8 will be described in greater detail the contact 8 is comprised of a base portion 200 having generally upstanding wall sections at 202 and 204 the wall sections 202 and 204 define a plurality of grounding contact portions at 206 208 and 210 each of the contact portions 206 210 is comprised of side edges 212 214 and 216 respectively having serrated edges at 220 222 and 224 also with respect to fig4 due to the cut out sections 230 the base portion 200 of the contacts 8 are bendable at 232 at both ends as will be described in greater detail herein finally as shown in fig4 and 5 the contact member 8 includes a locking lance 236 which has been struck from the base portion 200 to lock the contact in place in the.