[2 mm] 1 pc size: Approx 2.3 x 2 x 2 Hole size: Approx 1 mm [3 mm] 1 pc size: Approx 2.5 x 3 x 3 Hole size: Approx 1 mm [4 mm] 1 pc size: Approx 3.5 x 3.5 x 3 Hole size: Approx 1.5 Approx 6 x 6 x 6 Hole size: Approx 1.4 mm [5 mm] 1 pc size: Approx 4.5 x 5 x 5 Hole size: Approx 1.4 mm [6 mm] 1 pc size: Approx 6 x 6 x 6 Hole size: Approx 1.4 mm [8 mm] 1 pc size: Approx 8 x 8 x 8 Hole size: Approx 1.8 mm