Rigging screws in the Royal Navy comprise all four of these types, and they are known generally as screws and slips, screws without slips, or sometimes bottle-screws; type (4) is called a double-ender, or collapsing screw.
Izikrufu zokuxhobisa kwiRoyal Navy ziquka zontlanu ezindidi, zaziwa njengezikrufu zokunyebeleza okanye ngamanye amaxesha izkrufu zebhotile udidi lwe (4) lubizwa njengesiphelisi esiphindiweyo.