HM/TCT reversible blade for electric planer Bosch GHO 12V-20, 56 x 5.5 x 1.1 mm. 2 sets = 4 planer blades. Made of high quality carbide/tungsten carbide (TCT), Rockwell hardness: 90+HRC. The carbide blades last 5 times longer than the standard HSS planer blades. The packaging is made of solid cardboard and is without plastic.