20 Pair 1/32'' Ultra Thin Parallel Set 0.0001'' Square Precision 1/2 in 1-11/16 1/32" Ultra Thin Super Precision Parallel Set; 1/2" to 1-11/16" Height Range 1/16" Increments; 1/32" Thickness; Weight: 3.30lbs (roughly) 6" Length; 0.0001" Parallelism; 20 pair, 40 pieces total. Storage case INCLUDED; Case overall dimension: 7-3/4''L x 9-3/4''W x 3''H Quantity: 1 set (20 pair, total of 40 pieces)