2 x 12.7mm rounds ( .50 cal ) with projectiles attached. One has been put into a tap and dye and has a threadded head, possibly for ysing as a second cocking handle on a Browning M2 MG, the other has had the base sanded to remove any markings SL 4 ? inert 400 june 94 wark vc club, ammunition, 12.7mm, m2, 50 cal, inert