The Park Tool CM-5.2 chain cleaner set the standard for chain cleaners and is still great for home use might be used weekly or monthly but really isn't designed for heavy duty daily shop use and that''s where the Park CM-25 comes in. The Park CM-25 chain cleaner trades in the plastic body for a super durable cast aluminum one. All of the hardware in the CM-25 is made from rust resistant stainless steel included the latch to seal it up tight and prevent spills. The dual sided brushes clean all 4 sides of the chain and are replaceable for a long service life just make sure to get the RBS-25 brush kit. Upper and lower sponges help reduce drips for less mess.