ProductsHome / Concrete Hollow Blocks (CHB) / 3″ (68mm) 3″ (68mm) Category: Concrete Hollow Blocks (CHB) Description Thickness: 3″ (68mm) Compressive Strength (psi): 700 Length: 390 mm Height: 190 mm Area: 0.0741 m2 Related products 4″ (90mm) Read more 8″ (190mm) Read more Keystone Block Read more