Item Adapter reduction - 24/29 - 40/38 Material Glass Borosilicate 3.3 Dimensions (mm) socket - 24/29 cone - 40/38 Autoclavable Yes Temperature range (C) -70 to +500 (special care to avoid shock over 150) Reduction adapter with standard ground small socket and large cone. Made from high strength Borosilicate 3.3 glass.