The Captain Hook Skyhooks have been designed with a wide bottom section, in order to protect against undesired twisting. They have two holes in order to secure dogbones in them as needed. They come in three sizes: small, 23g; medium, 31g; large, 51g. The smaller sizes can be used for smaller cracks, troughs, holes, bars or even boreholes, while the large size can be used in the most varied of places. Enjoy big wall climbing! "