• Makita Brush Model # 181047-4
• Aftermarket carbon brush model # K21.
• Model # of tools that this brush is used on: 1805B, 1806B, 2012, 2030N, 2040, 2114, 2114C, 2400B, 2400B, 2401B, 2414, 2414PA, 2416S, 2702, 2708, 2711, 3601B, 3612B, 3612BR, 3612BRA