[3 mm] 1 pc size: Approx 2.5 x 3 x 3 Hole size: Approx 1.2 mm [4 mm] 1 pc size: Approx 3.5 x 4 x 4 Hole size: Approx 1.2 mm [5 mm] 1 pc size: Approx 4.5 x 5 x 5 Hole size: Approx 1.5 Approx 5.5 x 6 x 6 Hole size: Approx 1.5 mm [8 mm] 1 pc size: Approx 7.5 x 8 x 8 Hole size: Approx 1.5 mm