Ronstan single block standing 20 mm RF20141

 UV-resistant Acetal sheet.
· Double ball bearing system runs on a polished stainless steel rail and acetal base, providing minimal weight and great strength.
· Aluminum disc versions use Torlon® balls.
· 316 stainless steel swivel.
· Fiber-reinforced and UV-resistant nylon block.
· The cleaning holes in the ball bearings make it easy to flush salt and sand out of the balls to ensure the blocks have a long and reliable service life.