Seldén ratchet block (block with backstop for use primarily as a mainsheet foot block and for spinnaker and gennaker sheets run "off hand") with Delrin ball bearing and carbon fiber reinforced polyetherimide washer. The clamp is mounted to the block with flexible adjustable stainless steel outriggers. The ratchet function can be turned on and off with the knob on the side. Disc diameter: 60mm Working load: 240kg* breaking load: 480kg max. line diameter: 10mm with 5mm shackle *Based on the working load of the clamp.