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