4" plastic ball shells. (actual size is 3-3/4") ring & washer included per set. 6 Sets(12pcs) comes in 2 halfs. One half is just smooth round, the other half has a 1/4" fuse hole, perfect for our chinese fuse. Use Methylene chloride, xtlene or PVC cement to bond the 2 pieces together. All sets come with both halfs. If you buy 6 sets, you get 1 rounded half and 1 with 1/4" fuse hole.
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