Quick view FinJak FinJak - Tool Free Fin Adjustment for Single/Center Fins (4 Colors) Adjust Your Fin in Seconds, in & out of the water! SPECS & FEATURES The FinjakTool-Free surfboard fin installation device replaces the metal plate and screw of your single fin longboard, midlength, 2+1 surfboard or SUP and allows... Now: $12.95 MSRP: Was: Choose Options