Ronstan Series 19, C-Track - Slide, Soft- Attached Ring, Plunger Stop rudder bearing Durable UV resistant polyethylene outers

Durable UV resistant polyethylene outers resist abrasion and withstand the effects of salt water

VTT National Maritime Sweden

Can be surface or flush mounted

1 3/4" (45mm) Clearance for Ski Pole

So a skeg that is a  12 - 150 - 4K is a 12 degree 150mm drop 4 bolt skeg

Ronstan Series 19, C-Track - Slide, Soft- Attached Ring, Plunger Stop rudder bearing Durable UV resistant polyethylene outersRonstan Series 19, C Track Slide, Soft Attached Ring, Plunger Stop Features: Spring loaded plunger stops allow fast, positive positioning of track slides Slides are available with swivelling cleat and fairlead to suit different crewing positions RopeGlide ring has a 'soft' attachment which allows up to 250 rotation Applications: Dinghy and small catamaran jib sheet leads Dinghy outhauls