6061 T6 Superlight extra stiff, durable and lightweight alloy stem. Withstands the rough demands of fast, competitive cycling rides. 4 x Screws - safety system, extremely safe: four stainless steel screws to fix the handlebar. Two stainless steel screws to fix the stems on the steerer tube of your bike. Adjustable: 0 to 60 degrees. High angle for riding comfort and steering control. Low angle for speed and less wind resistance. Bar bore: 25. 4mm. Extensions: 90, 110mm. Standard for 1. 18" forks. Shims for 1" forks available separately. Use only handlebars with diameter of 25. 4mm.