B&S taper end mill adapter End mill holder Made of tool steel. B&S taper end mill adapter 

Model	BS NO.S	D(mm)	d(in)
			Single	Double
B&S7-d	B&S7	18.425	3/16 3/8 1/2 5/8 3/4	3/8 1/2
B&S9-d	B&S9	27.104	3/16 1/4 3/8 1/2 5/8 3/4 1 7/8	3/8 1/2 5/8
B&S10-d	B&S10	32.748	3/16 1/4 5/16 3/8 1/2 5/8 3/4 7/8 1 1-1/4 1-1/2	5/8 3/4
B&S11-d	B&S11	38.908	3/16 1/4 5/16 3/8 1/2 5/8 3/4 7/8 1 1-1/4 1-1/2 2	5/8 3/4

B&S taper end mill adapter