Arthritis and aging vs primer pockets led to the purchase of these pliers. You must be logged in to see this link. They came as advertised with built in springs so they maintain jaws open till squeezed shut thus eliminating that simple step. The resin jaws do securely grip any case without marring or crushing. Well worth the $10.00 IMO. 2 sets of extra jaws are $5.00 but I do not think they will be required for the case prep tasks I require.