Yes — see the Petzl Rig Descender for Petzl's top-of-the-line assisted-braking descender designed for rescue and industrial use

It is spliced on a quality locking steel snap

See the ISC Mini Rope Grab

reliable positioning buckstrap built for arborists who prefer a tighter adjustment range

Rock Exotica Hydra Pulley R-3/4X150-SS Yes — see the PetzlThe HYDRA is a triple attachment pulley which features a swivel top connection to facilitate the pulley's use on the saddle bridge, and for use in climbing systems. Rubber o rings line the connection points to assist in holding carabiners tightly to avoid dangerous cross loading. MBS: 28kN Max Rope: 13mm