The DongCheng HD092502 55-Piece Screwdriver Bit and Socket Set is an all-in-one professional master fastening solution designed for mechanical maintenance, electronics repair, automotive servicing, and comprehensive DIY tasks. This kit combines standard 1/4" heavy-duty bits and sockets with 4mm micro-precision bits, complete with dedicated ratcheting and precision driver handles.

Manufactured from industrial-grade Chrome Vanadium (CR-V) alloy steel, all components undergo heat treatment to deliver high torsional strength and wear resistance. The set includes 21 PCS of 1/4" (6.35x25mm) driver bits, 20 PCS of 4x28mm micro-precision bits, 9 PCS of 1/4" drive hex sockets (4mm to 12mm), multiple extension bit holders, a 1/4" hex-to-square adapter, a 1/4" hex reversible ratchet handle, and a 4mm precision driver handle. Packed in an organizer plastic case for complete mobility and workshop readiness.

Key Features

Master 55-Piece System: Combines 1/4" heavy-duty driving, 4mm micro-electronics precision, and metric hex socketry in one kit.
Industrial CR-V Steel Construction: High-tensile alloy steel prevents bit stripping, socket rounding, and drive wear.
Dual Handle Versatility: Features 1 PC 1/4" Hex reversible ratcheting screwdriver handle and 1 PC 4mm micro-precision driver handle.
Comprehensive 9-Piece Metric Socket Range: Includes 4, 5, 6, 7, 8, 9, 10, 11, and 12mm 1/4" drive sockets.
Extensive Bit Profile Coverage: Slotted, Phillips, Pozidriv, Torx, and Hex bit profiles in both standard and precision dimensions.
Modular Plastic Case: Molded carrying case keeps every bit, adapter, socket, and handle organized and secured.

Applications

Precision electronics repair, smartphones, laptops, drones, and small appliances
Automotive mechanical servicing, interior trim fasteners, and under-hood small nuts and bolts
Equipment assembly, industrial plant maintenance, and control cabinet servicing
General household maintenance, bicycle repairs, and comprehensive workshop utility

Technical Specifications

Parameter	Specification
Brand	DongCheng
Model Number	HD092502
Tool Type	55-Piece Screwdriver Bit, Socket & Ratchet Master Set
Material	Chrome Vanadium (CR-V) Steel
Standard Bits (21 PCS - 6.35x25mm)	SL4, SL5, SL6 / PH1, PH2, PH2, PH2, PH3 / PZ1, PZ2, PZ3 / T10, T15, T20, T25, T30, T40 / H3, H4, H5, H6
Precision Bits (20 PCS - 4x28mm)	SL1.5, SL2, SL2.5, SL3 / PH000, PH00, PH0, PH1 / T6, T7, T8, T9, T10, T15, T20 / H1.5, H2, H2.5, H3, H4
Sockets (9 PCS - 6.35mm Drive)	4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm
Bit Holders Included	1 PC Hex 4x60mm & 1 PC Hex 1/4"x50mm
Adapter Included	1 PC Hex-to-Square 1/4" Adaptor (25mm)
Handles Included	1 PC Ratchet Screwdriver Handle (1/4" Hex) & 1 PC Precision Handle (4mm Hex)
Packaging Type	Packed by plastic box

Size/Model-wise Table

Model	Total Items	Standard Bits	Precision Bits	Sockets	Handles Included	Holders & Adaptors	Packaging
HD092502	55 PCS	21 PCS (1/4"x25mm)	20 PCS (4x28mm)	9 PCS (4-12mm)	1x Ratchet, 1x Precision	2x Holders, 1x Adaptor	Plastic Box

DongCheng 55 PCS Screwdriver Bit & Socket Set (HD092502)

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