Cheap internal micrometer, Buy Quality micrometer directly from China micrometer internal Suppliers: Three-point Internal Micrometers 16-20mm.0.65-0.8inch.315-05-070
Range 2-6mm without extension rods.Measurement can be taken closer to the bottom of the blind bore, and can be taken into a deep hole with an extension rod.Highly durable because of carbide-tipped contact points.Ratchet stop. Titanium-plated anvils. Type:16-20mm*0.001mm Accuracy: 0.004mm.