0.257 in. ID 0.625 in. OD 0.500 in. Long Aluminum Spacer - AndyMark, Inc
Amazon.com: PATIKIL M6 Aluminum Spacers, 5 Pcs Metal Spacer Aluminum Round 6.2mm ID x 12mm OD x 8mm L Thickness Aluminum Spacer 1/4in ID Screw Standoff for 1/4" or M6 Screw Bolts :
Small Parts 370510RSA Round Spacer, Aluminum, Plain Finish, #10 Screw Size, 3/8" OD, 0.192" ID, 5/16" Length (Pack of 10): Hardware Spacers: Amazon.com: Industrial & Scientific
AluminumSpacers.com
1/2 Inch Aluminum Spacer With 1/4 Inch ID - Three Pedals
Aluminum Spacer 3/4" OD x 1/4" ID x Choose Your Length, Round Spacer Unthreaded Standoff Bushing Plain Finish, Fits Screws Bolts 1/4" or M6 by Metal Spacers Online (1" Length, 2 Pack):
0.375 in. ID 0.500 in. OD Aluminum Spacer at Various Lengths - AndyMark, Inc