BULL’S B-Grip TT Shaft – Polycarbonate – Black & Green – Short. Made from a polycarbonate material, this stem is provided with a locking ring to help keep your flight on the stem. Length: 35mm (not including the thread – 5mm) Thread size: 2baBULL’S B-Grip TT Shaft – Polycarbonate – Black & Green – Medium. Made from a polycarbonate material, this stem is provided with a locking ring to help keep your flight on the stem. Length: 48mm (not including the thread – 5mm) Thread size: 2baBULL’S B-Grip TT Shaft – Polycarbonate – Black & Green – Tweenie. Made from a polycarbonate material, this stem is provided with a locking ring to help keep your flight on the stem. Length: 41mm (not including the thread – 5mm) Thread size: 2baBULL’S B-Grip TT Shaft – Polycarbonate – Black & Green – Extra Short. Made from a polycarbonate material, this stem is provided with a locking ring to help keep your flight on the stem. Length: 28mm (not including the thread – 5mm) Thread size: 2ba