The Redding #6 Competition Shell Holder Set provides complete control over headspace with five precision shell holders sized in 0.002-inch increments for ultimate reloading accuracy.Redding #6 Competition Shell Holder Set (5-piece kit)Precision sized in 0.002-inch increments for fine headspace adjustmentEach shell holder clearly marked with headspace decrease amountHeavy-duty plastic storage box included for organizationProfessional-grade competition reloading equipmentEssential for competitive shooters and precision reloaders who demand exact case-to-chamber headspace control for consistent accurate ammunition performance.