16 x Alloy wheel tuner slim fit bolts. M12 x 1.5, 26mm Thread + star key
• Thread size: M12 x 1.5. What is M12 x 1.25?. • Thread length: 26mm. • Seat type: Taper (Cone shaped). • Bolt material: Heat treated carbon alloy steel. Radius - this looks like a bowl. This is the size of the thread.