that two holddown fingers 26 are sufficient to secure the cementing plug 10 in the casing 15 under test conditions one holddown finger 26 may be sufficient as the wipers 25 already act to center the plug 10 a plurality of holddown fingers 26 may be spaced circumferentially about the plug individually or joined as shown in fig4 each finger 26 may be separately embedded in the elastomeric covering 24 or as shown in fig4 for ease of production the plurality of angled holddown fingers 26 may extending radially and cantilevered from a ring 40 the ring 40 can be embedded in the elastomeric covering 24 about the core 20 further an inner edge 41 of the ring 40 can be profiled as an anchor 42 for better securing the ring 40 in the elastomeric covering 24 having reference again to fig3 and in a second embodiment of the invention the holddown fingers 26 can be embedded within the elastomeric wipers 25 as is the case with the previously described embodiment the holddown fingers 26 can be discrete and embedded individually within the wipers 25 or can extend periodically from a ring 40 which can be embedded about the core 20 individually the holddown fingers 26 may extend from the cementing plug 39 s core 20 or may have an anchor 30.