Includes (1) 2610009839 Shaft Lock Assembly. New, Bulk Packed. Genuine OEM Replacement Part # 2610009839. Consult owners manual for proper part number identification and proper installation. Please refer to list for compatibility. Compatible with the following:Dremel: 300, 780, 3000, 800, 380-6, Meets industry standards. Ideal for professionals. Ideal for professionals.