The crooks are one-piece, key indications refer to a1 = 440 Hz, unless otherwise stated.

Depending on the key, the crooks have two different shapes – 180° shape (simple bend) for the high keys and 540° shape (turned bend) for the lower keys. Only the D415 crook is available in both versions. In its 180° form, this crook leads to a very long overall instrument. In order to be able to hold it easier, we offer the significantly shorter 540° version.

For most crooks we offer the choice between standard and historic design.