1. Barrel reamer-2: Specification: Size: 200-2000mm Suitable for soft soil. Connection with drill rod: Direct connection with drill rod Octagonal connection Connection with laid pipe: Within or without swivel 2. Cutting reamer: Specification: Size: 200-2000mm Suitable for hard soil and strong-mantle rock. Connection with drill rod: Direct connection with drill rod Octagonal connection 3. Barrel reamer-3: Specification: Size: 200-2000mm Suitable for soft soil. Connection with drill rod: Direct connection with drill rod Octagonal connection Connection with laid pipe: Within or without swivel 4. Barrel reamer-1: Specification: Size:200-2000mm Suitable for soft soil. Connection with drill rod: Direct connection with drill rod Octagonal connection Connection with laid pipe: Within or without swivel 5. Fluted reamer: Specification: Size: 200-2000mm Suitable for sand and medium-to-very hard soil. Structure: Steel casting, Welded Connection with drill rod: Direct connection with drill rod Octagonal connection Connection with laid pipe: Within or without swivel