Shurhold - Shur-LOK Curved Adapter - 10" - 102CH. Scrub the crown of your vertical surfaces easily with this unique adapter. It's 10" with a 30-degree angle, allowing you to change the angle of your brush to scrub the hardtop, waterline, and more.. Those hard-to-reach areas become easier to clean with the 10 inch (25 cm) curved adapter. It adds 10 inches (25 cm) and a 30-degree angle to any of our SHUR-LOK equipped accessories. The two holes at the end provide for 180 degree rotation.. 10" Curved Adapter. Adds a 30-degree angle to any of our SHUR-LOK equipped accessories. Two holes at the end provide for 180-degree rotation