Pool solar roller and cover reels

This solar roller is removable roller compaosed of Stainless Steel+Aluminium tube+ABS.Use a elastic rope to connect a bubble cover(solar cover) and the roller.Turn the roller handle,and the cover will be rolled onto the aluminium tubes. For this cover reels we havesix different specification,the details as follow: 1.In-ground Pool Cover Reel W/S.S. Frame For 3-3/4'' tubes; 3*2.15M Length 2.In-ground Pool Cover Reel W/S.S. Frame For 3-3/4'' tubes; 3*2.4M Length 3.In-ground Pool Cover Reel W/S.S. Frame For 3-1/4'' tubes; 3*2.15M Length 4.In-ground Pool Cover Reel W/S.S. Frame For 3-1/4'' tubes; 3*2.4M Length 5.In-ground Pool Cover Reel W/S.S. Frame For 3-1/4'' tubes; 3*2.7M Length 6.In-ground Pool Cover Reel W/S.S. Frame For 3-1/4'' tubes; 5*2.15M Length And also attached detail instructions about it.