Insight Chain Tensioners feature a two-mounting hole design for better adjustability with a shorter overall length. Twin holes give you all the adjustment you need to keep your rear wheel from moving and also lengthen frame life by giving you a more secure clamping area on your dropouts. Insight Chain Tensioners were designed to work with todays longer dropouts, so you can adjust your rear wheel to work in any position, while adding color and security on your wheel moving.• Fits 3/8" axles • 55 grams / pair • Made from forged aluminum Brand: Insight