2Pcs 1/2" to 1/4" Router Collet Reduction Sleeve Tool Bit - - Amazon.com
High Precision Steel Router Collet Reducer 3/4 Overall Dia x 5/16 Inner Dia x 1-1/4 Inch Long: Router Bits, Router Bit Parts & Accessories, High Precision Router Collet Reducers
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Craftmaster 6.4mm Collet Router Bit To Suit 12.7mm Shaft Router - Bunnings Australia