well apparatuses with device for preventing their relative rotation with respect to adjacent well apparatuses and anti - rotation devices for well apparatuses , including , but not limited to , plugs , float shoes , float collars , jars , and clutch devices for packers . in one embodiment a non - rotation device has a main member with a recess on which are disposed a plurality of teeth with a load member adjacent the teeth for bearing a load put on the device and for isolating the teeth from the load , the teeth extending beyond the recess . in one embodiment the teeth are configured , disposed , and profiled to facilitate their interengagement with other teeth and to contain between them foreign objects which might impede proper interengagement . in various embodiments plugs are provided with such anti - rotation devices . in various embodiments the load member is a continuous circular ring disposed about the apparatuses outer periphery or around the opening of a channel through the device . the load members may be non - continuous upstanding members .