1、2 BUBBLE LEVELS: Quick release plate mount has 2 bubble levels, one for vertical and the other for horizontal. Engraved scale for easy adjustment of camera gravity. 2、CHEMICAL OXIDATION TREATMENT: Quick release plate clamp body is chemically oxidized for a matte appearance that remains colorfast, fingerprint resistant, acid and alkali resistant, and abrasion resistant. 3、NON SLIP LOCKING: Quick release clamp is equipped with a non slip locking feature to make your shooting more convenient. Compatible with universal ball head and 38mm/1.5in quick release plate. 4、SCOPE OF APPLICATION: Camera quick release plate mount is designed for ARCA Swiss 38mm width size and can be mounted with 1/4in or 3/8in female screw. 5、CNC MACHINED: Camera quick release clamp is made of low density metal and high hardness aluminum alloy, machined by computer numerical control (CNC) machine.