Fowler 0-4IN Blackface Machinist Grade Dial Caliper Fowler's 4 Compact-sized Machinist Grade Dial Caliper features exceptional accuracy. Solid stainless steel construction for a long life of reliable service.. Four-way jaw for outside, inside, depth and step measurements. Solid stainless steel construction. Silky smooth movement throughout. Dial hand completes one revolution per each .100. .001 reading dial face. Shockproof design prevents dial backlash. Thumbroll for rapid setting. Knurled lock assures precise settings. Includes case 52-008-714-0