If you are crabbing/fishing in a strong current, these will help your rig stay in place.  The 5oz spiders/sputniks hold like a 10oz pyramid.  Attach it to the duo loc snap on the Crabber Grabber and they help grapple the sand keeping it from drifting.  A quick even pull like motion "setting the hook" will snare the crab and will release the steel arms, folding them back to help prevent drag when reeling in.  To reset them, pull the steel arms down into the grooves on the side of the lead.  ***Quick Tip-  if it feels too loose then squeeze the opposing sides together before sliding them into the grooves***