K-tech Bike Bicycle Handlebar Mount for Garmin eTrex 10 20 30 Dedicated slide fit GPS holder with retaining tab - fits Garmin eTrex 10 20 30. Deluxe clamp base fits handlebars, rails bars as small as 3mm diameter up to 45mm in diameter. Anti slip jaws work on round, square or oval horizontal or vertical struts along with flat surfaces. No tools needed