4 parts of sand 1 part of cement
3 parts of sand 2 part of cement
2 parts of sand 1 part of cement
1 parts of sand 1 part of cement
Caisson bolt
Ball type bolt
Frame type bolt
Block type bolt
Rag bolt
Lewis bolt
Cotter bolt
Nut bolt
Only comfort
Only safety
Comfort & safety
Hygiene
Terminology
Physiology
Opthalmology
Anthology