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The axle hole is (3.0 mm) 0.118" dia. and a width of (16.4 mm) 0.645". They are lightweight at 8.8 grams/ea for the 275SSL and 10.2 grams/ea for the 300SSL. These also have many more applications in school projects and various crafts.
This product was added to our catalog on July 2, 2018