Jewellers Tools Set Of 2 Clock Winding Keys - All Sizes Brass Spider Star Pair - Odd And Even THIS IS A SET OF 10 CLOCK KEYS KEY ONE NUMBERS 2, 4, 6, 8, 10 HOLE SIZES ARE 2.75, 3.25, 3.75, 4.25 AND 4.75MM KEY 2 NUMBERS 3, 5, 7, 9, 11 HOLE SIZES ARE 3.0, 3.5, 4.0, 4.5 AND 5MM