Clamps are die-cast from aluminum and have rubber grips to prevent slippage Loaded springs create enough pressure to hold burettes securely Powder coated finish on surface prevents from scratches and ensures long time use Do not obscure the buret graduation lines and numbers Colour:Blue+white Material:aluminum Package Contents: 1 * Double Burette Clamp Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.