TWIST SOCKET SET. MATERIAL 40CR, SIZES: 9MM (OUTSIZE 16MM; LENGTH 27MM); 10MM (OUTSIDE 16MM LENGTH 27MM ); 11MM (OUTSIZE 17MM LENGTH 27MM); 12MM (OUTSIZE 19MM LENGTH 27MM); 13MM (OUTSIZE 19MM LENGTH 27MM); 14MM (OUTSIZE 21MM LENGTH 27MM); 15MM (OUTSIZE 22MM LENGTH 27MM); 16MM (OUTSIZE 24MM LENGTH 27MM); 17MM (OUTSIZE 24MM LENGTH 27MM); 19MM (OUTSIZE 27MM LENGTH 27MM) ( 3/8" SQUERE DRIVE) LONG WERSION; 10 PCS IN ALUMINIUM BOX