This is a pair of quality inner flange and outer lock nut set, made of iron material with integrated molding and precision CNC machining. Designed to modify angle grinders from 100mm to 125mm, allowing compatibility with 20mm and 22mm bore grinding discs. Features: Compact size, lightweight and portable, easy to carry and store. Constructed from iron material with integrated molding and CNC machined to standard specifications. Heat-treated for increased hardness and toughness, providing wear resistance and extended service life. Compatible with 100mm angle grinders. Enables conversion from 100mm to 125mm disc size. Supports installation of 20mm and 22mm bore grinding discs. Specifications: Name: Angle Grinder Accessory Material: Iron Item Size: 40 x 40mm (1.57 x 1.57in) Package Size: 150 x 100 x 50mm (5.91 x 3.94 x 1.97in) Package Weight: 98g (3.47oz) Packing List: 1 x Inner Flange 1 x Outer Lock Nut