Billiard Accessories -Billiard Cue Extension/Extension/Extender Highlights Generic Brand Billiard Cue Extension/Extension/Extender Description: The joint made of premium aluminum screws in the billiard cue center shaft extension Makes 1.57 reach inches; Quick and easy to put on and take off Suitable for 5/16-18 tooth billiard or snooker sticks Lightweight and high strength for a perfectly balanced and natural shot Comes with a straightness checker for checking the direction of the tail rod / rod (roll the rod / tail alone and see if there is a wobble) specification: Material: aluminum Length: 4 cm / 1.57 inch Thread length: 1 cm / 0.39 inch The color black Checker: Material: aluminum alloy + plastic Size (LxWxH): 5x3x3cm / 1.97x1.2x1.2 inch Color: blue, white Package includes: 2 pcs pool straightness checker with carrying case Tail extender billiard table 1 piece Note: Please allow slight difference due to manual measurement. THANKS