Product Name: Inner Outer Flange;Fit Model: Makita 9523NB Grinder Thread Diameter: 8.5mm / 5/16";Outer Nut Size: 8.5x 30 x 7.7mm / 0.33" x 1.2" x 0.3"(Inner Dia*Outer Dia*T) Inner Nut Size: 10 x 30 x 6mm / 0.4" x 1.2" x 0.24"(Inner Dia*Outer Dia*T);Material: Metal Color: Black , white Tone;Weight: 40g For Makita 9523NB GrinderInner outer flange to use together. Accessories only, Makita 9523 angle grinder is not included. NON-OEM product for Makita 9523 angle grinder. Package Contents: 2 Pair x Inner Outer Flange(non-OEM) Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.