A die-cast tremolo block is also included! It's a 10.8mm pitch. MONTREUX Montreux Stainless Arm Metric 60's ver.2 ■ Tremolo arm for Stratocaster ■ Selected Parts ■ This is a stainless steel arm with a small 60's style bend. It has a diameter of 5mm, suitable for Japanese-made guitars, etc. ■ Metric standard (screw diameter 5mm) The condition is good as it was only installed once after purchase. Please refrain from purchasing if you are nervous or if you are slow to respond or receive the item.